The leases were led in size by notable design firm Chermayeff & Geismar & Haviv, which is known for the J.P. Morgan Chaseoctagon and NBC’s peacock among other noticeable logos.

Chermayeff signed a new five-year lease for approximately 5,500-square-feet space on the ninth floor of the 11-story building between Fifth Avenue and Avenue of the Americas. The design company will share the space with architecture firm Rivkin-Weisman P.C. The companies are relocating from the seventh floor of 137 East 25th Street, where they also shared a space together. They are building out the space now, and expect to move in within a few months.

Among the other leases was a renewal and expansion signed by Agency Coulter, a marketing agency. The firm signed a five-year lease renewal and expanded 1,200 square feet to a total of 3,500 square feet on the seventh floor.

Kaufman’s Ian Norris, Grant Greenspan and Aron Orbach handled leasing for the building, and also represented the tenants in both of those transactions. Asking rents in the 120,000-square-foot office building are in the mid-$60’s per square foot.

“Twenty-seven West 24th Street caters to a diverse group of tenants,” Mr. Norris said in prepared remarks. “From smaller technology start-ups on the cusp of growth booms to established, mid-sized companies and new media and creative firms, the property has become an attractive destination for organizations that want to be in the thick of Midtown South’s vibrant atmosphere.”

Also among the 12 deals, tech firm Flyby Media signed a new two and a half year lease for 3,300 square feet of space in the building. Nick Zarnin and Andrew Margolin of Savills Studleybrokered the deal on behalf of the tenant. Messrs. Zarnin and Margolin weren’t immediately available for comment.

Other leases that were signed include Israel-based start-up Meetey with a five year 2,100-square-foot lease; non-profit Flatiron 23rd Street Partnership with a five-year lease renewal for 2,100 square feet; design studio Shamir Shah Design with a new seven-year lease for an 1,800-square-foot space; start-up Stocktwits with a three-year lease for 1,800 square feet; Rhapsody Music & Cinema with a 1,300-square-foot lease renewal for three years.